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DifferentialRevisionHasParentRelationship.php
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			<?php

			final class DifferentialRevisionHasParentRelationship
			extends DifferentialRevisionRelationship {

			const RELATIONSHIPKEY = 'revision.has-parent';

			public function getEdgeConstant() {
			return DifferentialRevisionDependsOnRevisionEdgeType::EDGECONST;
			}

			protected function getActionName() {
			return pht('Edit Parent Revisions');
			}

			protected function getActionIcon() {
			return 'fa-chevron-circle-up';
			}

			public function canRelateObjects($src, $dst) {
			return ($dst instanceof DifferentialRevision);
			}

			public function shouldAppearInActionMenu() {
			return false;
			}

			public function getDialogTitleText() {
			return pht('Edit Parent Revisions');
			}

			public function getDialogHeaderText() {
			return pht('Current Parent Revisions');
			}

			public function getDialogButtonText() {
			return pht('Save Parent Revisions');
			}

			protected function newRelationshipSource() {
			return new DifferentialRevisionRelationshipSource();
			}

			}